4024/11 Oct/Nov 2021, Question 12: Simultaneous Equations by Elimination
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Solve the simultaneous equations 2x − y = 12 and 7x + 3y = 29, showing all working.
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Solution · 3 marks
- 1From 2x − y = 12: y = 2x − 12
- 27x + 3(2x − 12) = 29
- 313x − 36 = 29, so 13x = 65, x = 5
- 4y = 2 × 5 − 12 = −2
- 5x = 5, y = −2
Answerx = 5, y = −2
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Also searched as: 4024/11/O/N/21 · 4024_w21_qp_11 · 4024 w21 11 · question 12.
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